66509 ÷ 9 = 7389 R8
Sure thing! Let's divide 66509 by 9 together.

Step 1:
9 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 6 to get 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 9

Step 2:
9 goes into 66 7 times with a remainder of 3.
Write down 7 as next digit of of the result. 
Result so far: 7
Subtract 63 from 66 to get 3.
Bring next digit (5) of the dividend behind the 3 and repeat the process: 35 / 9

Step 3:
9 goes into 35 3 times with a remainder of 8.
Write down 3 as next digit of of the result. 
Result so far: 73
Subtract 27 from 35 to get 8.
Bring next digit (0) of the dividend behind the 8 and repeat the process: 80 / 9

Step 4:
9 goes into 80 8 times with a remainder of 8.
Write down 8 as next digit of of the result. 
Result so far: 738
Subtract 72 from 80 to get 8.
Bring next digit (9) of the dividend behind the 8 and repeat the process: 89 / 9

Step 5:
9 goes into 89 9 times with a remainder of 8.
Write down 9 as next digit of of the result. 
Result so far: 7389
Subtract 81 from 89 to get 8.

The final result is 7389 with a remainder of 8.